Treesearch
Displaying 20,671 - 20,680 of 65,202 Publications- EPIDERMAL PATTERNING FACTOR1 (EPF1) is a well characterized negative regulator of cell division in Arabidopsis thaliana (AtEPF1) where the primary region of localization is the leaf. However, little data have been reported on the role of EPF1 in other plant species. In this study, the EPF1 gene from Arabidopsis and the newly identified poplar ortholog from Populus trichocarpa (PtaEPF1) were overexpressed in a hybrid poplar genotype. We attempted to identify the physiological role of PtaEPF1. Gene overexpression experiments were performed to determine if and how stomatal density (SD)...AuthorsShaneka Lawson, Paula M. M. Pijut, Charles H. MichlerKeywordsSourceGenes & Genomics. 36(4): 427-441.Year2014
- Undulations in weather patterns have caused climate shifts of increased frequency and duration around the world. The need for additional research and model data on this pressing problem has resulted in a plethora of research groups examining a particular tree species or biome for negative effects of climate change. This review aims to (1) collect and merge recent research data on regeneration within old- and new-growth forests, (2) highlight and expand upon selected topics for additional discussion, and (3) report how shade tolerance, drought tolerance, and inherent plasticity affect tree...AuthorsShaneka Lawson, Charles H. MichlerSourceJournal of Forestry Research. 25(1): 3-20.Year2014
- Recent physiological analysis of Arabidopsis stomatal density (SD) mutants indicated that SD was not the major factor controlling aboveground biomass accumulation. Despite the general theory that plants with fewer stomata have limited biomass acquisition capabilities, epf1 and several other Arabidopsis mutants varied significantly in leaf fresh weight despite having similar stomatal numbers. The in-depth mechanisms controlling increased or decreased leaf area biomass remain undetermined. This work used calculations of SD, overnight water-loss, and LI6400XT measurements to reject the...AuthorsShaneka Lawson, Paula M. M. Pijut, Charles H. MichlerKeywordsSourceJournal of Plant Biology. 57(3): 162-173.Year2014
- This resource update provides an overview of forest resources in Iowa based on an inventory conducted by the U.S. Forest Service, Forest Inventory and Analysis (FIA) program at the Northern Research Station in cooperation with the Iowa Department of Natural Resources. Estimates are based on field data collected using the FIA annualized sample design and are updated yearly, for the measurement years 2009-2013 with comparisons made to 2004-2008. The current, 2009-2013, sample data consist of 641 field measured plots on forest land, with about 20 percent of plots measured each year. Data used...AuthorsMark D. Nelson, Matt BrewerSourceResource Update FS-1. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 4 p.Year2014
- Phloem is like an enigmatic central banker: we know how important phloem is to plant function, but very little about how phloem functions as part of a whole-plant economy. Phloem transports carbohydrates, produced by photosynthesis and hydrolysis of reserve compounds, to sink tissues for growth, respiration and storage. At photosynthetic tissues, carbohydrates are loaded into phloem (Rennie and Turgeon 2009), a process that raises the solute concentration. This increased solute concentration then raises turgor pressure in the transport stream by drawing water from the xylem through...AuthorsMichael G. Ryan, Shinichi AsaoKeywordsSourceTree Physiology. 34: 1-4.Year2014
- Across sites in Brazil and Hawaii, LMA and Nmass were strongly correlated with height and shade index, respectively, which may help simplify canopy function modeling of Eucalyptus plantations. Abstract Within tree canopies, leaf mass per area (LMA) and leaf nitrogen per unit area (Narea) commonly increase with height. Previous research has suggested that these patterns occur as a strategy to optimize carbon gain by allocating available resources to upper canopy leaves that are exposed to greater light availability. We tested three hypotheses about the influences of height, shade index (a...AuthorsAdam P. Coble, Alisha Autio, Molly A. Cavaleri, Dan Binkley, Michael G. RyanKeywordsSourceTrees. 28: 1-15.Year2014
- Forests provide key ecosystem services (ES) and the extent to which the ES are realized varies spatially, with forest composition and cultural context, and in breadth, depending on the dominant tree species inhabiting an area. We address the question of how climate change may impact ES within the temperate and diverse forests of the eastern United States. We quantify the vulnerability to changes in forest habitat by 2100, based on the overall pressures of community change from an aggregation of current and potential future habitats for 134 tree species at each of 149 US Department of...AuthorsStephen Matthews, Louis Iverson, Matthew Peters, Anantha M. Prasad, Sakthi SubburayaluKeywordsSourceLandscape Ecology. 29(2): 213-228.Year2014
- In commemoration of the journal's 40th anniversary, the co-editor explores themes and trends covered by Landscape and Urban Planning and its parent journals through a qualitative comparison of co-occurrence term maps generated from the text corpora of its abstracts across the four decadal periods of publication.Cluster maps generated from the VOSviewer program reveal a coalescence of concepts for the last two decades along three knowledge domains: human dimensions, landscape analysis and planning, and urban ecology. Citation impact "heat maps" offer additional clues about emerging and...AuthorsPaul H. H. GobsterKeywordsSourceLandscape and Urban Planning. 126: 21-30. [editorial].Year2014
- Forests in northern Michigan will be affected directly and indirectly by a changing climate during the next 100 years. This assessment evaluates the vulnerability of forest ecosystems in Michigan's eastern Upper Peninsula and northern Lower Peninsula to a range of future climates. Information on current forest conditions, observed climate trends, projected climate changes, and impacts to forest ecosystems was considered in order to draw conclusions on climate change vulnerability. Upland spruce-fir forests were determined to be the most vulnerable, whereas oak associations and barrens were...AuthorsStephen Handler, Matthew Duveneck, Louis Iverson, Emily Peters, Robert M. Scheller, Kirk R. Wythers, Leslie Brandt, Patricia Butler, Maria Janowiak, P. Danielle Shannon, Chris Swanston, Amy Clark Eagle, Joshua G. Cohen, Rich Corner, Peter B. Reich, Tim Baker, Sophan Chhin, Eric Clark, David Fehringer, Jon Fosgitt, James Gries, Christine Hall, Kimberly R. Hall, Robert Heyd, Christopher L. Hoving, Ines Ibáñez, Don Kuhr, Stephen Matthews, Jennifer Muladore, Knute Nadelhoffer, David Neumann, Matthew Peters, Anantha M. Prasad, Matt Sands, Randy Swaty, Leiloni Wonch, Jad Daley, Mae Davenport, Marla R. Emery, Gary Johnson, Lucinda Johnson, David Neitzel, Adena Rissman, Chadwick Rittenhouse, Robert ZielKeywordsSourceGen. Tech. Rep. NRS-129. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 229 p.Year2014
- The statistical analysis of wildfire activity is a critical component of national wildfire planning, operations, and research in the United States (US). However, there are multiple federal, state, and local entities with wildfire protection and reporting responsibilities in the US, and no single, unified system of wildfire record keeping exists. To conduct even the most rudimentary interagency analyses of wildfire numbers and area burned from the authoritative systems of record, one must harvest records from dozens of disparate databases with inconsistent information content. The onus is...AuthorsKaren C. ShortKeywordsSourceEarth System Science Data. 6: 1-27.Year2014